RAM Track Ball Composite Fishfinder Mount for Humminbird Devices (RAP-B-107B-354-TRA1U) (sku 53787)The RAP B 107B 354 TRA1U consists of a Track Ball base, composite double socket arm and connecting Humminbird Apelco marine adapter base. The mount is designed with a RAM 1" diameter rubber ball and socket system that has adjustment points at both ends of the double socket arm allowing for high adjustability to achieve perfect viewing angles. This kit is compatible with virtually any track system including the RAM Tough Track. Holder dimensions (1)